Mainz 2012 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 57: Instrumentation

HK 57.3: Vortrag

Freitag, 23. März 2012, 11:45–12:00, P 2

Cluster Usage Increasing by Virtualization for On-line Clusters — •Stefan Boettger, Udo Kebschull, Camilo Lara, and Jochen Ulrich — Infrastructure and Computer Systems for Data Processing (IRI), Goethe-University Frankfurt/Main

The ALICE HLT Cluster is a computing farm doing on-line event processing for the ALICE Experiment at CERN. It is known that at run-time of the experiment there are phases where few or no data is available for processing. The same applies for maintenance cycles of both the experiment and the cluster. With respect to the costs of maintaining and running such a cluster there is the need to maximize the usage of this computing facility. A toolset has been developed which makes free cluster resources available for third-party applications. The toolset uses virtualization to host third party applications and, most importantly, can be configured such, that the event processing is not affected by third party applications. This is achieved by both local and central resource (re)allocation mechanisms, e.g. by using suspend/resume or live-migration. In this work results like increased cluster usage are shown for the co-operation of event-processing and third party applications. Furthermore a synthezised, more general application is run together with third party applications to demonstrate the suitability of the toolset for other environments.